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A failing VSS will also cause erratic tach function. My symptom happened when cruise was engaged. For no apparent reason the cruise cut-out, and both the RPMs and Speedometer reading suddenly decreased. No blinking D4. Replaced VSS and symptom has never again occurred.
If you have a blinking D4 a code has been set. Retrieve the code.
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Eyebrows
KMS Strut Bar
Enkei 16" J-Lips
Wings West Spoiler w/LED
Clear Corner Lens
Clear Bumper Lens
Clear Rear Side Markers
Brembo X-Drilled/Slotted
Stainless Braided Brake Hoses
Focus 2500 Driving Lamps
Gold Pkg
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